House Atreides is one of the Great Houses of the Landsraad, the feudal assembly of noble families that governs the Imperium alongside the Padishah Emperor. Renowned for their honour, military excellence, and the loyalty they inspire in their followers, the Atreides are respected throughout the known universe - and feared by the Emperor precisely because of that respect. Their ancestral home is the ocean world of Caladan, but the events of Dune begin when they are granted stewardship of Arrakis, the desert planet and sole source of the spice melange. The house's central members across the saga include Duke Leto, Lady Jessica, Paul, Alia, and the twins Leto II and Ghanima. The Atreides bloodline carries the genetic legacy of the Bene Gesserit breeding programme and produces some of the most powerful prescient minds in human history.